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ATK vs AZUR heat pumps

Measured against models of the same size and duct type, AZUR scores higher on 4 of the 6 ratings. ATK has 13 outdoor models, AZUR has 13 outdoor models. ATK and AZUR have no QMID on file and are not ranked.

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CompareData as of updated · sources

Against comparable models

Each cell is the share of same-size, same-type models that the manufacturer’s typical model beats (50% is typical); the higher score is in bold. Raw medians are underneath for context: they depend on which sizes each one makes, so they are not compared.
ATK and AZUR on every ratingPeer scores, 0–100 · grey ticks: every ranked manufacturer · shaded: the middle half of each one’s modelsMeasured against models of the same size and duct type, AZUR scores higher on 4 of the 6 ratings.
  • ATK
  • AZUR
  • Other ranked manufacturers
ATKAZUR

Source: AHRI Directory, NEEP · as of

Average peer percentile, raw median and rank among ranked manufacturers
RatingATKAZUR
Efficiency index47%median —56%median —
COP at 5°F51% (higher)median 1.9144% (higher)median 1.86
Capacity retention at 5°F57%median 79%69%median 77%
HSPF275% (higher)median 9.439% (higher)median 8.6
SEER244%median 15.549%median 18.0
EER220%median 10.041%median 10.5
Heating capacity at 5°F64%median 27,000 Btu/h65%median 26,000 Btu/h
Outdoor models1313
AHRI certifications2416

Share of models meeting each standard

Percent of each manufacturer’s models with a qualifying certification
StandardATKAZUR
CEE 2025 Tier 1 (Split ASHP)53.8%7 models61.5%8 models
CEE 2026 Tier 1 (Split ASHP)38.5%5 models61.5%8 models
CEE Advanced Tier (Split ASHP)0%0 models0%0 models
Xcel Energy Colorado cold-climate ASHP (2025)46.2%6 models61.5%8 models
DOE Cold Climate Heat Pump Challenge0%0 models0%0 models
ENERGY STAR Cold Climate0%0 models38.5%5 models

Sizes and duct types offered

Models in each peer group, with the efficiency index of those models against the rest of the group.
Side by side, inside each size and duct typeShape: every model of the group · bars: each manufacturer’s middle half, median dot, 10th–90th line · 3 groups where both have models
  • ATK
  • AZUR
  • All models of the group
Ducted, up to 1.5 tons2.00884 modelsDucted, 2 tons2.00821 modelsDucted, 2.5–3 tons1.901,614 modelsDucted, 3.5–4.5 tons1.911,492 modelsNon-ducted, up to 1.5 tons1.902,417 modelsNon-ducted, 2 tons1.87611 modelsNon-ducted, 2.5–3 tons1.85975 modelsNon-ducted, 3.5–4.5 tons1.97438 modelsmedian

Raw ratings are only placed side by side within one size and duct type, where they are comparable.

Source: AHRI Directory · as of

Models per peer group · efficiency index within the group
Size and duct typeATKAZUR
Ducted, up to 1.5 tons2 · index 43%None
Ducted, 2 tons2 · index 49%1 · index 46%
Ducted, 2.5–3 tons5 · index 45%1 · index 63%
Ducted, 3.5–4.5 tons4 · index 50%2 · index 51%
Non-ducted, up to 1.5 tonsNone5 · index 57%
Non-ducted, 2 tonsNone2 · index 68%
Non-ducted, 2.5–3 tonsNone1 · index 70%
Non-ducted, 3.5–4.5 tonsNone1 · index 45%

Cold-climate and all-around picks, size class by size class

Each manufacturer’s best model on each board in every size and duct type, side by side; the higher score is in bold. Both scores are 0–100 against every model of that size class (the line on each bar is 50, the typical model there), so the two compare fairly even when they make different sizes.

Cold-climate picks

Best cold-climate pick per size and duct type (keeps at least 70% of its heat at 5°F). Qualifies when its capacity retention at 5°F (capacity at 5°F as a share of capacity at 47°F) is at least 70% and Capacity retention at 5°F, COP at 5°F, HSPF2 are all rated. Score = the equal-weight mean of its peer percentiles on Capacity retention at 5°F, COP at 5°F, HSPF2 (share of the other models in its peer group it beats, 0–100), all from one certified pairing: in each duct type a model is sold in, its qualifying pairing of that type with the best score; equal scores (one decimal) go to the higher heating capacity at 5°F.
Size and duct typeATKCold-climate score, best modelAZURCold-climate score, best model
Ducted, up to 1.5 tons64.3(50 is the typical model of its size class)ACI-AUO18SHP-Mwith ducted air handler ACI-BCO24CP171 of 2 models qualify · AHRI 212386850No models in this size class
Ducted, 2 tons69.5(50 is the typical model of its size class) (higher)ACI-AUO24SHP-Mwith ducted air handler ACI-AUI24VHE2 of 2 models qualify · AHRI 21238684957.5(50 is the typical model of its size class)AZ-24HPBwith ducted air handler AH-24B1 of 1 models qualify · AHRI 207036527
Ducted, 2.5–3 tons78.6(50 is the typical model of its size class) (higher)ACI-AUO36SHP-Mwith ducted air handler ACI-CCO36CP213 of 5 models qualify · AHRI 21238684775.1(50 is the typical model of its size class)AZ-36HPBwith ducted air handler AH-36B1 of 1 models qualify · AHRI 207036530
Ducted, 3.5–4.5 tons73.8(50 is the typical model of its size class) (higher)ACI-AUO48SHP-Mwith ducted air handler ACI-AUI48VHE2 of 4 models qualify · AHRI 21238684356.6(50 is the typical model of its size class)AZ-48HPBwith ducted air handler AH-48B1 of 2 models qualify · AHRI 207036533
Non-ducted, up to 1.5 tonsNo models in this size class54.9(50 is the typical model of its size class)AZ-12CA22EXTwith ductless indoor unit AZ-12CA22INT2 of 5 models qualify · AHRI 205417845
Non-ducted, 2 tonsNo models in this size class56.8(50 is the typical model of its size class)AZ-24M322SCO1 of 2 models qualify · AHRI 206346136
Non-ducted, 2.5–3 tonsNo models in this size class64.0(50 is the typical model of its size class)AZ-36M422SCO1 of 1 models qualify · AHRI 206347268
Non-ducted, 3.5–4.5 tonsNo models in this size class41.9(50 is the typical model of its size class)AZ-42M522SCO1 of 1 models qualify · AHRI 206346141

All-around best

Best all-around model per size and duct type. Score = 50% heating, the mean of its peer percentiles on COP at 5°F, Capacity retention at 5°F, HSPF2, plus 50% cooling, the mean of its peer percentiles on SEER2 and EER2 (share of the other models in its peer group it beats, 0–100). All five ratings are required; there is no minimum heat kept at 5°F. In each duct type a model is sold in, it is scored on its pairing of that type with the best score; equal scores (one decimal) go to the higher cold-climate score, then the higher heating capacity at 5°F.
Size and duct typeATKAll-around score, best modelAZURAll-around score, best model
Ducted, up to 1.5 tons51.9(50 is the typical model of its size class)ACI-AUO18SHP-Mwith ducted air handler ACI-BCO24CP172 of 2 models have all five ratings · AHRI 212386850No models in this size class
Ducted, 2 tons67.3(50 is the typical model of its size class) (higher)ACI-AUO24SHP-Mwith ducted air handler ACI-AUI24VHE2 of 2 models have all five ratings · AHRI 21238684946.3(50 is the typical model of its size class)AZ-24HPBwith ducted air handler AH-24B1 of 1 models have all five ratings · AHRI 207036527
Ducted, 2.5–3 tons57.8(50 is the typical model of its size class)ACI-AUO36SHP-Mwith ducted air handler ACI-AUI36VHE5 of 5 models have all five ratings · AHRI 21238684563.2(50 is the typical model of its size class) (higher)AZ-36HPBwith ducted air handler AH-36B1 of 1 models have all five ratings · AHRI 207036530
Ducted, 3.5–4.5 tons53.3(50 is the typical model of its size class)ACI-AUO60SHP-Mwith ducted air handler ACI-AUI60VHE3 of 3 models have all five ratings · AHRI 21238684257.3(50 is the typical model of its size class) (higher)AZ-48HPBwith ducted air handler AH-48B2 of 2 models have all five ratings · AHRI 207036533
Ducted, 5 tons and up45.6(50 is the typical model of its size class)ACI-SDAUO60SHPwith ducted air handler ACI-AUI60VHE1 of 1 models have all five ratings · AHRI 213430648No models in this size class
Non-ducted, up to 1.5 tonsNo models in this size class56.8(50 is the typical model of its size class)AZ-12CA22EXTwith ductless indoor unit AZ-12CA22INT2 of 5 models have all five ratings · AHRI 205417845
Non-ducted, 2 tonsNo models in this size class67.5(50 is the typical model of its size class)AZ-24M322SCO1 of 2 models have all five ratings · AHRI 206346136
Non-ducted, 2.5–3 tonsNo models in this size class69.5(50 is the typical model of its size class)AZ-36M422SCO1 of 1 models have all five ratings · AHRI 206347268
Non-ducted, 3.5–4.5 tonsNo models in this size class44.5(50 is the typical model of its size class)AZ-42M522SCO1 of 1 models have all five ratings · AHRI 206346140

All-around board, every manufacturer

Standout model on each rating

Each manufacturer’s model that beats the largest share of comparable models on the rating; the higher share is in bold.
Top model per rating by peer percentile, with its AHRI-certified value and peer group
RatingATKAZUR
COP at 5°Fbeats 76% · 2.20ACI-AUO18SHP-MDucted, up to 1.5 tonsbeats 75% · 2.05AZ-36HPBDucted, 2.5–3 tons
Capacity retention at 5°Fbeats 92% · 92%ACI-AUO48SHP-MDucted, 3.5–4.5 tonsbeats 99% · 113%AZ-36M422SCONon-ducted, 2.5–3 tons
HSPF2beats 93% · 10.0ACI-AUO36SHP-MDucted, 2.5–3 tonsbeats 83% · 9.5AZ-36HPBDucted, 2.5–3 tons
SEER2beats 69% · 17.3ACI-SDAUO30SHPDucted, 2.5–3 tonsbeats 85% · 22.0AZ-24M322SCONon-ducted, 2 tons
EER2beats 50% · 11.7ACI-AUO24SHP-MDucted, 2 tonsbeats 84% · 12.5AZ-36M422SCONon-ducted, 2.5–3 tons
Heating capacity at 5°Fbeats 95% · 48,500 Btu/hACI-AUO60SHP-MDucted, 3.5–4.5 tonsbeats 89% · 36,000 Btu/hAZ-36M422SCONon-ducted, 2.5–3 tons

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